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   难度：Medium
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   <h1 class="question_title">
    201. Bitwise AND of Numbers Range
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   <p>
    Given a range [m, n] where 0 &lt;= m &lt;= n &lt;= 2147483647, return the bitwise AND of all numbers in this range, inclusive.
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    <strong>
     Example 1:
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<strong>Input:</strong> [5,7]
<strong>Output:</strong> 4
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    <strong>
     Example 2:
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   <pre>
<strong>Input:</strong> [0,1]
<strong>Output:</strong> 0</pre>
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    201. 数字范围按位与
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   <p>
    给定范围 [m, n]，其中 0 &lt;= m &lt;= n &lt;= 2147483647，返回此范围内所有数字的按位与（包含 m, n 两端点）。
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    <strong>
     示例 1:&nbsp;
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   <pre><strong>输入:</strong> [5,7]
<strong>输出:</strong> 4</pre>
   <p>
    <strong>
     示例 2:
    </strong>
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   <pre><strong>输入:</strong> [0,1]
<strong>输出:</strong> 0</pre>
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